Ignition magneto



Feb. 9, 1932.- G, F s. 1,844,218

IGNITION MAGNETO Fil ad July 30, 1950 k I 17 ,AEVQTZZ'O r: I 4 19 6 5 .2 jzssact Z 1 :5 A Q I Patented Feb. 9, 1932 UNITED STATES I PATENT OFFICE GIUSEPPFJ FOSS ATI, OF MONZA, ITALY, ASSIGNOR I'O FAIBIBRICA ITALIANA MAGNETI MARELLI SOCIETA ANONIMA, OF MILAN, ITALY, A COMPANY OF ITALY IGNITION MAGNETO 2 Application filed July 30, 1930, Serial No.

One of the objects of this invention is abody or frame for ignition magnetos which provides a unitary structure or casing adapted to enclose all the parts of the magneto, said casing being open on one face and having recesses adapted to contain the several magneto parts andwhich lead to said open face, while a removable cover is located on said open face of said casing and is passed through by the magneto parts which are required to extend outside of said casing for the magneto drive and control and for distribution of the current generated by said magneto.

' Another object of the invention is a device for fastening said cover on said magneto casing.

A further object of the invention is an arrangement for the location and mounting of the removable magneto parts in said casing, as a condenser or the like.

On the annexed drawings, are shown by way of example an embodiment of the present invention and Figure 1 is a front view of the magneto body of the invention as seen from the current distributor end and deprived of its cover; H

Figure 2 is a side view of the same;

Figure 3 is a view from the opposite end with respect to-Fig. 1;

Figure 4 is a fragmentary transverse section of the magneto body on line 4-4 of Figures 2 and 5;

Figure 5 is a fragmentary plan section on the line 55 of Fig. 4, witha condenser located in a space of said casing.

Figure 6 is a fragmentary front end view on an enlarged scale of the magneto body with a cover and cover fastener;

Figure I is a fragmentary plan section on the line 7--7 of Figure 6.

As shown in the drawings, the magneto body consists of a unitary casing which comprises an intermediate portion 1 providing a bottom plate 2 for mounting the magneto on a supporting member of an engine,

471,818, and in Italy September 5, 1928. v

and an'end seat 3 for bearings ofthe magintegral hood 4 adapted to contain at its top a current distributor, not shown, and at its bottom a circuit breaker and ignition advance means.

Hood 4 is closed by a cover 5 fastened thereon by fastening means hereinafter described and located in the body recesses 19; means fordrive and control of the magneto and leads feeding current to sparking plugs (not shown) extend through said seat 3 and cover 5.

The body 1 provides a chamber 7 for the magneto armature,- a bore 8 in which a magneto rotor is mounted to rotate, and a number of recesses made therein for the purposeof reducing its weight, some of said recesses being capable of use for the location of mag neto parts, as a condenser as hereinafter described. I

The bore of the seat 3 is adapted to receive a bearing for the magneto driving shaft, and a suitable gland or packing device is provided therein.

The body according to the invention may be conveniently produced by casting and it may enclose within it the parts of the iron or magnetic circuit as pole shoes and the like; it provides a unitary structure and thus any joint/and connecting means may be omitted. This feature is of great importance, it having been found that screws and other connecting means are subject to loosening under the vibrations that the magneto undergoes during operation, and finally, the openings of the casing in register with the hood 4 and bearing seat 3 maybe fluid sealed by a suitable mounting of the cover 5 and driving shaft.

As above referred to, recesses provided in the magneto body'l'may be availed of to arrange therein parts required for the magneto operation; such an arrangement is shown in Figures 4 and 5 in respect to the condenser usually found in the primary circuit of the magneto and connected across the poles of the primary circuit breaker.

As shown in Figures 4 and 5, a bore 9 made in said ma eto body 1 comprises a seat providin a s oulder 10 and'extending into a taperingr'ecess'll. A condenser'12 .which consists, as known, of a pair of conducting sheets coiled with an mtermedlate insulating sheet in the shape of a cylinder, is located from, and one of the b0 y recesses is availed of for its location without a space for a condenser having to be purposely provided; further, the condenser is held safely in position without fastening the screws which are liable to become loose.

Of course condensers of any shape and con,- struction may be used for the purposes of the ,presentinvention and the shape of the bore or space 9' availed of for the condenser locaj tionma be any preferred one instead of cylindrica as illustrated by way of example. 7

Figures 6 and 7 show a preferred construction of means for-mounting the cover on the magneto body. j

'As shown in said figures, an enlargement 16 is provided "on each-side of the magneto body 1 and-a bore 17 having a seat 18 shaped as a .portion'ofa sphere is provided in said enlargement, said Ybore opening on a side in a transverse slot 19 open to the outside.

A ball head 20 of a stem 21 is engaged in said seat 18 and said stem 21 has a flange 22 at its end opposite said ball head. Stem 21 is encircled by a sleeve 23 having an inturned end flange 24 and --a head 25- on its opposite end, said head 25 having transverse lugs 26; a spring 27 is located intermediate stem 21 and sleeve 23 and the respective flanges 22 and 24.

The connecting member consisting of the stem 21 and sleeve 23 may be easily mounted by inserting the spring 27 into sleeve 23 and then the stem 21 into said spring 27 and sleeve 23 with its ball end 20 forward, said stem being inserted throu h 8. hereof the sleeve head 25 which therea er may be closed in any suitable manner, say by a plug 28.

Of course, the described arrangement is duplicated on each side of the magneto.

Said connecting member is then engaged with the magneto body 1 by inserting the head 20. into bore 17 and causing the restricted portion 21' of stem 21-connecting-it with the end ball 20 to passthrough theslot 19. v

Said resilient connecting member is thus engaged with the body llandthen it is elongated and moved into a recess'29 of the cover 5, the head 25and lugs 26 of the same being sprm To remove sald resilient connectin memher and cover, a pull is exertedon t e head 25toelongate saidmember and remove its head- 25-26 from the cover seat 29 -30; thereafter the said connecting member is moved through with respect-t0 the position of Figure 7; it is then held in such sition by the abutment of the outer end 0 the sleeve flange 24 against the side of the bod enlargemenzt 16 due to the action 0 the After the cover 5 has been located again on the magneto bod 1, said connecting member is moved bac into the position of are 7, it entering a sin said cover seat while the lugs 26 0% head 25 again engage the front recesses 30 of the cover 1;

Of course many modifications lying within the spirit of the appended claims may be embodied in the construction which has been described merely by way of, example.

What I claim as my invention and desire to secure by United States Letters Patent is 1. A body for ignition magnetoes comprising a casingopen on a face said casin providing an intermediate ortion intende to contain the magneto fiel system, an end seat for a shaft bearing and a front hood receiving the current distributor and breaking mechanism of the magneto, a front coverclosing said .hood and passed through b magneto control means, and the current fee mg means, and an extensible resilient member' interconnecting said casing and cover, said member, consisting of two telescoping parts and a' springintermediate the same, one of said parts being floatingly anchored in aseat of one of said casing and cover members and the other art en aging cooperating means on the ot er of t em.

2. A body for ignition magnetoes comprisin a casin open on a face, said casing provi mg an intermediate portion intended to contain the magneto eld s m, an end seat fora shaft bearing a front hood receiving the current the breaking mechanism of the maigneto, a front cover closing said hood an passed stributor and through by the magneto control means, and

the current feeding means, resilient member interconnecting said casing and cover, said member comprising a part- 7 having an end ball head floatingly anchored through by said ball-head and'enc osing said' flange of said first named part, a spring intermediate said sleeve and first named part and abutting on said respective flanges, and

. means on said sleeve engagin the other one and cover mem rs.

of' said casi ot ignition'magnetoes comprisand an extensible ing a casing open on a face, said casing ing a part having an end ball head floatingly anchored in a seat of one of said casing and cover members and a flange on its opposite end, said seat having a transversely open slot leading thereinto, a sleeve having an inturned end flange passed through by said ball -.head and enclosing said flange of said first named part, a spring intermediate said sleeve and first named part and abutting on said respective flanges, and means on said sleeve engaging the other one of said casing and cover members.

4. A body for ignition magnetoes comprising a casing open on a face, said casing providing an intermediate portion intended to contain the magnetofield system, an end seat for a shaft bearing and a front hood rcceiving the current distributor and the breaking mechanism of the magneto, a front cover closing said hood and passed through by magneto control means, and the current feeding means, and an extensible resilient member interconnecting said casing and cover, said member comprising a part having an end ball head floatingly anchored in a seat of one of said casing and cover members and a flange on its opposite end, said seat having a transversely open slot leading thereinto and opening in an outer surface transverse to that in which opens said spherical seat a sleeve having an inturned end flange passed through by saidball head and enclosing said flange of said first named part, a spring intermediate said sleeve and first named part and abutting on said respective flanges, and

means on said sleeve engaging the other one of said casing and cover members.

5. A body for ignition magnetoes, comprising an integral hollow casting in the formof a casing having a front wall at one end and being open at the other end, said front wall providing aseat for a shaft bearing, a front hood on said open end adapted to receive the current distributor and breaking mechanism of the magneto, said casing being provided, in a lateral wall, with a hollow space open at one end, a condenser located in said hollow space with one of its armatures in direct contact with said casing, resilient means engaging said condenser in said space, a cover adapted to close said hood of said casing, and resilient means for removably connecting said cover with said casing.

6. A body for ignition magnetoes, comprising an integral hollow casting in the form of a casing having a front wall at one end and being open at the other end, said front wall providing'a seat for a shaft bearing, a front hood on said open end adapted to receive the current distri utor and breaking mechanism of the magneto, said casing being provided, in a lateral wall, with a cylindrical hollow space open at one end, a rolled condenser located in said hollow space with its outer surface in direct contact with said casing, resilient means engaging said condenser in said space, a cover adapted to close said hood of said casing, and resilient means for removably connecting said cover with said casing.

7. A body for ignition magnetoes, comprising an integral hollow casting in the form of a casing having a front wall at one end and being open at the other end, said front wall providing a seat for a shaft bearing, a fronthood on said open end adapted to receive the current distributor and breaking mechanism of the magneto, said casing being provided, in a lateral walL with a cylindrical hollow space open at one end, the surface confining said hollow space being provided with an annular recess at its outer end, a rolled condenser located in said hollow space with its outer surface in direct contact with said casing, an expansible rin removably seated in said annular recess an en gaging said condenser in said space, a cover adapted to close said hood of said casing, and resilient means for removably connecting said cover with said casin In testimony whereof I have signed my name to this specification.

GIUSEPPE FOSSATI.

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